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Riley Heating & Air Conditioning

1019 Knowles Rd, Phenix City, AL 36869, United States

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+1 334-298-1278

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Mon-Sun, 8am – 9pm

Space pressure can be either favorable or negative with regard to outside the space. Positive pressure takes place when there is more air being provided than exhausted, and prevails to decrease the infiltration of outside pollutants. Natural ventilation is a key consider decreasing the spread of air-borne health problems such as tuberculosis, the typical cold, influenza and meningitis.

Natural ventilation requires little maintenance and is inexpensive. A cooling system, or a standalone a/c, offers cooling and humidity control for all or part of a structure. Air conditioned structures often have sealed windows, because open windows would work against the system meant to keep consistent indoor air conditions.

The percentage of return air made up of fresh air can usually be controlled by adjusting the opening of this vent. Normal fresh air intake has to do with 10%. [] A/c and refrigeration are supplied through the removal of heat. Heat can be eliminated through radiation, convection, or conduction. Refrigeration conduction media such as water, air, ice, and chemicals are described as refrigerants.

It is crucial that the air conditioning horsepower suffices for the area being cooled. Underpowered a/c system will lead to power wastage and ineffective usage. Sufficient horsepower is required for any air conditioning unit set up. The refrigeration cycle utilizes four essential aspects to cool. The system refrigerant begins its cycle in a gaseous state.

From there it gets in a heat exchanger (in some cases called a condensing coil or condenser) where it loses energy (heat) to the outdoors, cools, and condenses into its liquid stage. An (also called metering device) controls the refrigerant liquid to flow at the correct rate. The liquid refrigerant is gone back to another heat exchanger where it is enabled to vaporize, hence the heat exchanger is typically called an evaporating coil or evaporator.

In the procedure, heat is taken in from indoors and transferred outdoors, resulting in cooling of the building. In variable environments, the system may consist of a reversing valve that changes from heating in winter season to cooling in summer season. By reversing the flow of refrigerant, the heatpump refrigeration cycle is changed from cooling to heating or vice versa.

Free cooling systems can have very high efficiencies, and are in some cases integrated with seasonal thermal energy storage so that the cold of winter season can be utilized for summertime cooling. Typical storage mediums are deep aquifers or a natural underground rock mass accessed through a cluster of small-diameter, heat-exchanger-equipped boreholes.

The heat pump is added-in due to the fact that the storage acts as a heat sink when the system is in cooling (as opposed to charging) mode, triggering the temperature to gradually increase during the cooling season. Some systems include an “economizer mode”, which is often called a “free-cooling mode”. When economizing, the control system will open (fully or partially) the outside air damper and close (totally or partly) the return air damper.

When the outdoors air is cooler than the required cool air, this will allow the need to be met without utilizing the mechanical supply of cooling (normally chilled water or a direct expansion “DX” system), hence conserving energy. The control system can compare the temperature of the outside air vs.

In both cases, the outside air must be less energetic than the return air for the system to get in the economizer mode. Central, “all-air” air-conditioning systems (or plan systems) with a combined outside condenser/evaporator unit are frequently set up in North American residences, workplaces, and public structures, but are difficult to retrofit (install in a building that was not developed to receive it) since of the large duct required.

An alternative to packaged systems is the use of different indoor and outside coils in split systems. Split systems are preferred and commonly used worldwide except in The United States and Canada. In North America, split systems are frequently seen in domestic applications, however they are gaining popularity in small business structures.

The advantages of ductless a/c systems consist of easy installation, no ductwork, greater zonal control, versatility of control and peaceful operation. [] In space conditioning, the duct losses can account for 30% of energy consumption. The usage of minisplit can lead to energy savings in area conditioning as there are no losses connected with ducting.

Indoor units with directional vents install onto walls, suspended from ceilings, or suit the ceiling. Other indoor units install inside the ceiling cavity, so that short lengths of duct manage air from the indoor system to vents or diffusers around the spaces. Split systems are more effective and the footprint is usually smaller sized than the plan systems.

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